We chose to base ourselves in Soriano and take trips away from there. There is a lot of life within reach in car, train or bus day trips. We did not use the car every day, we did not leave Soriano every day. Our choice was to be living in a pleasant and interesting place, with good food etc.
If you were just staying in Soriano for a few days, going separately to Rome, etc, then no need for a car in Soriano.